Careless, deliberate and concealed inaccuracies are not different descriptions of how large a tax error is. They describe the behaviour that caused an inaccurate return, claim or document to be submitted. A significant understatement can arise despite reasonable care, while a relatively small figure can be deliberate where the taxpayer knew it was wrong.
The behaviour classification affects the penalty range, the available reduction for disclosure and the period over which HMRC may be able to assess the underlying tax.
How HMRC Assesses Careless, Deliberate and Concealed Inaccuracies
HMRC must establish what the taxpayer knew, what steps were taken, what records were available and why the inaccurate figure was submitted. The conclusion should be based on evidence rather than the size of the adjustment or the taxpayer’s failure to agree immediately with HMRC.
An inaccuracy is careless where the taxpayer failed to take reasonable care. The standard is that of a prudent and reasonable person in the taxpayer’s position, taking account of their abilities and circumstances. Reasonable care does not require perfection, but it may require professional advice where the issue is complex and the taxpayer lacks the necessary knowledge.
Evidence can include bookkeeping procedures, instructions given to an adviser, correspondence, prior advice, reconciliations, checks performed before signing the return and action taken when uncertainty was identified.
Deliberate Behaviour Requires Knowledge of the Inaccuracy
A deliberate but not concealed inaccuracy arises where a person submits a document knowing that it contains an inaccurate figure. HMRC does not necessarily need to prove that the taxpayer knew the correct amount; it must establish that the taxpayer knew the reported amount was not accurate.
Examples may include knowingly omitting cash sales, entering an estimated deduction while knowing that no cost was incurred, or excluding a known source of income. Negligence, misunderstanding or poor records do not automatically prove deliberate behaviour, although the surrounding evidence may show that the explanation is not credible.
The definition of deliberate inaccuracy distinguishes conscious submission of a wrong figure from a careless failure to check it. HMRC bears the burden of proving careless or deliberate behaviour on the balance of probabilities.
Careless, Deliberate and Concealed Inaccuracies Where Records Were Altered
A deliberate inaccuracy becomes deliberate and concealed where active steps are taken to hide it before or after the document is submitted. Concealment requires more than simply failing to volunteer the truth.
Creating false invoices, altering records, maintaining a second set of accounts, hiding bank accounts or providing a fabricated explanation can amount to active concealment. HMRC’s deliberate and concealed inaccuracy guidance treats this as the most serious behaviour category.
Poorly organised records are not automatically concealment. The question is whether deliberate steps were taken to cover the taxpayer’s tracks.
Behaviour and Disclosure Are Separate Decisions
Cooperation after an error is found does not ordinarily convert deliberate behaviour into carelessness. It can, however, reduce the penalty within the applicable range.
For standard onshore inaccuracies, the penalty ranges are 0% to 30% for an unprompted careless disclosure and 15% to 30% where prompted. Deliberate but not concealed inaccuracies carry ranges of 20% to 70% unprompted and 35% to 70% prompted. Deliberate and concealed inaccuracies carry ranges of 30% to 100% unprompted and 50% to 100% prompted. Different and potentially higher rules can apply to offshore matters.
The final percentage reflects the quality of disclosure through telling HMRC about the issue, helping to quantify it and giving access to relevant records. A disclosure is unprompted only where the person had no reason to believe HMRC had discovered or was about to discover the inaccuracy.
Evidence of Reasonable Care Should Be Preserved
Taxpayers using an adviser remain responsible for taking reasonable steps appropriate to their circumstances. They should provide complete information, question figures they know are inconsistent and retain evidence of the instructions and documents supplied.
An HMRC tax investigation should address behaviour separately from the underlying tax calculation. Where an undisclosed error is identified before HMRC intervention, a carefully prepared tax disclosure may preserve the possibility of unprompted treatment and demonstrate the quality of the correction.
Disclaimer: This article is provided for general guidance only and does not constitute personal tax, legal or financial advice. The correct tax treatment depends on the specific facts, applicable legislation and HMRC practice at the relevant time. You should contact us for advice tailored to your circumstances before taking or refraining from any action.
